There are people who have got normal Wiimotes working using GlovePIE.
WiiLi.org Wii Linux - GlovePIE:GlovePIE WiiLi.org GlovePIE Wii-Mote Scripts
I don't know how the drum connection differs, but since they have the wii guitar working, the drums shouldn't be too much different... (I'm curious about getting this working now too.)